Lil' Alert Mates - Barry Cuda 1 Year Monitor LM</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Monitors Toxic Ammonia In Freshwater And Marine Aquariums</li><li>Innovative Color Devices For Continuously Detecting And Monitoring Toxic Free Ammonia; Easy To Use， Install， And Read</li><li>A sensor changes reversibly from yellow to green to blue， relative to the ammonia concentration</li><li>No Test Kits， Chemicals， Or Procedures Are Needed</li><li>It Lasts Over A Year And Replacement Sensors Are Available</li></ul></div></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br><img src='http://ecx.images-amazon.com/images/I/41GU3t1nziL.jpg' noproxy></br>